prevalence

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Period prevalence of disease excludes Mycobacterium gordonae (a rarely pathogenic species) and is calculated as the total number of persons whose illness fulfilled disease criteria ([greater than or equal to] 2 sputum nontuberculous Mycobacterium isolates or 1 bronchoscopic or biopsy nontuberculous Mycobacterium isolate) during 1 of the 5-year periods of interest (1998-2002 and 2006-2010), divided by the Ontario population at the midpoints of the periods (2000 for 1998-2002 and 2008 for 2006-2010).
Period prevalence rates were obtained for each racial group.
Firstly, admission register lists of all hospitalised children were used to determine HIV status (collected from laboratory and/ or hospital records) and calculate HIV period prevalence.
Finally, we investigated the effect of using weekly period prevalence data rather than point prevalence data, assuming the same recall error (Table 2).
Period prevalence estimates of blood doping for the various subpopulations of samples are shown in Table 2.
measuring the conditions of a population at a certain point in time) as opposed to period prevalence (i.
We determined period prevalence of asthma at baseline by taking the number of definition 1 or 2 asthma cases occurring from birth to 12 months after the index BLL and dividing it by the total number of children in the cohort at that time.
We performed a period prevalence study using 120 patients seen for routine medical care at an urban family medicine center.